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NO FMC_SDNCAS alternate function info in

sheng yang
Senior

I want to design a baord with stm32h7b0zbt6 with extranal sdram chip W9825G6KH-6. I get PG15 with FMC_SDNCAS alt func in datasheet as below:

Screenshot from 2024-04-05 07-23-59.png

But when I looked the PG15 alt func config I get as below info, I could not found an alternate function number for FMC_SDNCAS here ?? why they are not consistent ?
Screenshot from 2024-04-05 07-24-23.png

 

1 ACCEPTED SOLUTION

Accepted Solutions
mƎALLEm
ST Employee

Hello,

Here the full list of PG port AF12 mapping :

PG0 - AF12 - FMC_A10
PG1 - AF12 - FMC_A11
PG2 - AF12 - FMC_A12
PG3 - AF12 - FMC_A13
PG4 - AF12 - FMC_A14/FMC_BA0
PG5 - AF12 - FMC_A15/FMC_BA1
PG6 - AF12 - FMC_NE3
PG7 - AF12 - FMC_INT
PG8 - AF12 - FMC_SDCLK
PG9 - AF12 - FMC_NE2/FMC_NCE
PG10 - AF12 - FMC_NE3
PG11 - AF12 - N/A
PG12 - AF12 - FMC_NE4
PG13 - AF12 - FMC_A24
PG14 - AF12 - FMC_A25
PG15 - AF12 - FMC_NCAS

The document will be updated in the next revisions.

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12 REPLIES 12
mƎALLEm
ST Employee

Hello,

Most probably it's a miss in table 14. By analogy with STM32H743 PG15 has FMC_SDNCAS alternate function.

The internal ticket 178406 has been submitted to confirm and fix the issue.

I will keep you informed for any feedback.

 

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Tks ,waiting for your reply.

Update: issue confirmed. 

The internal ticket 178406 has been summitted to fix this issue.

Thank you. 

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

What's the tentative solution? Fix the table? Hiding stuff in internal tickets doesn't help visibility for users.

Use AF12 for PG15 and PG14 ??

PG14 has a FMC_Ax assignment, didn't check others.

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The doubt was about PG15 in table 14. Nothing about PG14.

SofLit_0-1712584400562.png

Moreover, CubeMx has already the correct alternate function FMC_SDNCAS on PG15:

SofLit_1-1712584546779.png

The the only stuff to fix is the table 14 in the datasheet: PG15 should have FMC_SDNCAS alternate function on it.

 

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

Because I didn't use CubeMX, is the AF num is AF12 as FMC_SDNCAS with PG15?

Yes it's mapped on PG15/AF12

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

I'm say the in the OP's top post, that both PG14 (FMC_A25) and PG15 (FMC_SDNCAS) fail to show settings in the AF Table. The RM is the controlling document, so it's important it's correct(ed).

h7_pg14_pg15.jpg

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PG12, PG13, PG14, and PG15 are not correctly documented

h7_pg12_13_14_15.jpg

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